ph indicator Articles

  • What are the main indicators of water quality?

    “Water is the driving force of all nature;” so said Leonardo da Vinci. The survival of our planet depends on the availability of water and the condition that it is in. It is therefore vital to make sure that it is able to provide a hospitable environment for those that live in it, and is free from harmful levels of substances for those that drink it. Not ...


    By Aquaread Limited

  • Sorption equilibrium, thermodynamics and pH-indicator properties of cresyl violet dye/bentonite composite system

    The aim of the present study was to develop cresyl violet (CV)/bentonite composite system, to investigate the equilibrium sorption of the fluorescent dye on bentonite, to determine the characteristic equilibrium and thermodynamic parameters of the system by appropriate empirical isotherm models and to assess its pH-indicator properties. The absorption characteristics of CV solutions were ...


    By IWA Publishing

  • pH Theory & Measurement

    WHAT IS pH? pH is a short form for the Power (p) of Hydrogen (H). pH is defined as the negative log of the hydrogen ion activity, aH~ or the effective hydrogen ion concentration. Descriptive Definition pH is a unit of measure which describes the degree of acidity or alkalinity of a solution. Acidity is defined as the concentration of hydrogen ions [H+] in ...


    By IC Controls Ltd.

  • pH Probe Maintenance

    The success or failure of pH measurement depends on the proper application of the probe and proper subsequent maintenance of the probe. The procedures described within apply to the most common pH probe in use today and that is the flat surface combination pH probe. The most common failure mode associated with pH probes is breakage. The pH electrode is a very thin glass membrane that is easily ...


    By Digital Analysis Corp.

  • pH Adjustment - A Primer

    A brief review of the definition of pH, the pH scale, and some of the chemistry involved in pH Adjustment systems is provided below. For some this may be trivial, yet for many others this may be useful. The information provided below is typical of the background information we provide in our training classes / seminars. By Definition pH is the measure of free hydrogen activity in water and can be ...


    By Digital Analysis Corp.

  • Getting back to basics: What is pH?

    Getting back to basics: What is pH? The most used measure in wastewater treatment, and for good reasons The “potential of hydrogen” or “pH” is the measure of free hydrogen activity in water and thereby indicative of the measure of its free acidity or free alkalinity. Gauged on a numeric scale of 0-14, solutions with a pH of less than 7.0 are acids. ...


  • Using LC50 for metals as Water Quality indicator

    One of the causes of low yields or productive deficiencies, in the stage of production of fresh water, more gifts in the aquaculture industry of salmon in Chile, has its origin in the presence of naturally occurring metals, both in bodies of fresh water as in deep wells. The toxicity of metals such as Aluminum and Copper, others, has been described previously and their presence in waters of our ...


    By Aquaknowledge

  • How can I measure the pH of food?

    Measuring pH in food is a useful indicator of consistency over batches for quality control but can also be used to monitor foods where the pH changes over time – for example in yogurt production, brewing or to test the freshness of foods. Standard pH electrodes will often struggle when used in food samples, as the reference junction becomes blocked the reaction time will get slower and ...


    By Camlab Limited

  • DOD evaluates bioaugmentation for remediating low-pH aquifers

    The US Department of Defense (DOD) has completed pilot-scale work on the 'MAG-1' site at Fort Dix, NJ, to test suitability of anaerobic bioremediation for an aquifer with low pH. Project results will be used to design full-scale ground-water treatment at MAG-1. In addition, technical criteria gained from the demonstration will be integrated into DOD’s remediation strategy for its many facilities ...

  • Regrowth of bacterial pathogen indicators after advanced electro-osmotic dewatering of biosolids

    Applying an electrical field for 10 min to mechanically dewatered biosolids increased dryness to 35 to 45% and reduced Escherichia coli levels to/close to detection limits. Possible reasons for the regrowth of bacterial pathogens impacted by electro-osmotic dewatering are biosolids dryness, low pH and the generation of bacterial oxidants on the anode due to high temperatures. Testing for this ...


    By Inderscience Publishers

  • pH control for enhanced reductive bioremediation of chlorinated solvent source zones

    Enhanced reductive dehalogenation is an attractive treatment technology for in situ remediation of chlorinated solvent DNAPL source areas. Reductive dehalogenation is an acid-forming process with hydrochloric acid and also organic acids from fermentation of the electron donors typically building up in the source zone during remediation. This can lead to groundwater acidification thereby ...


    By True Blue Technologies, Inc.

  • Effects of pH on uranium uptake and oxidative stress responses induced in Arabidopsis thaliana

    Uranium (U) causes oxidative stress in Arabidopsis thaliana plants grown at pH 5.5. However, U speciation and as such its toxicity strongly depends on environmental parameters, e.g. pH. It is unknown how different U species determine U uptake and translocation within plants and how they might affect the oxidative defense mechanisms of these plants. The present study aimed to analyze U uptake ...


    By John Wiley & Sons, Ltd.

  • Evaluating alkaline microcapsules for pH control and reductive dechlorination of trichloroethylene in sediment

    Near neutral pH has been reported in the literature to optimise trichloroethylene (TCE) reductive dehalogenase activity in purified enzyme solutions, cell extracts and cell suspensions. In this study, microencapsulated alkaline buffers were used to evaluate potential use in controlling pH in soil microcosms and columns containing sediment obtained from a TCE-contaminated acidic aquifer at the ...


    By Inderscience Publishers

  • The Effects of pH on Enhanced Reductive Dechlorination: Growth vs. Activity

    This past May at the International Symposium on In-Situ and On-Site Bioremediation sponsored by Battelle, I attended a session entitled “Microbial Ecology of Reductive Dechlorination and the pH Impact.” The presentation contained fascinating information about a seemingly well understood parameter, pH. Although a relatively simple parameter, the effect of pH on enhanced reductive dechlorination ...


    By REGENESIS

  • pH and redox buffering systems of landfill leachate contaminated aquifer materials

    Introduction of landfill leachate into an aerobic aquifer leads to a variety of redox and pH buffering reactions between dissolved chemical species and aquifer sediments, which play profound effects on the behaviours of contaminants beneath and down gradient from the landfill. The specific objective of this study was to determine the spatial and temporal variations of pH and redox buffering ...


    By Inderscience Publishers

  • Assessment of membrane fouling indices during removal of reactive dye from batik wastewater

    ‘Batik’ is known as one of the most popular textile industries in Malaysia, and it produces wastewater in its processing. The wastewater contains reactive dye and is released into drains as well as rivers. It could cause harm to the environment and interrupt the food chain due to the chemicals contained in it. The aim of the present study is to determine the flux performance and modified ...


    By IWA Publishing

  • Relationship between water quality parameters and the survival of indicator microorganisms – Escherichia coli – in a stormwater wetland

    Indicator microorganisms – Escherichia coli – in a stormwater wetland controlling non-point source pollution in the Keum River basin was studied and the relationship between water quality parameters and the survival of E. coli was investigated by Pearson correlation analysis based on 16 sets of data collected on dry days. A significant seasonal variation of the ...


    By IWA Publishing

  • Evaluation of corrosion and scaling tendency indices in a drinking water distribution system: a case study of Bandar Abbas city, Iran

    Corrosion and scaling is a major problem in water distribution systems, thus evaluation of water corrosivity properties is a routine test in water networks. To evaluate water stability in the Bandar Abbas water distribution system, the network was divided into 15 clusters and 45 samples were taken. Langelier, Ryznar, Puckorius, Larson–Skold (LS) and Aggressive indices were determined and ...


    By IWA Publishing

  • Esterase autodisplay: enzyme engineering and whole-cell activity determination in microplates with ph sensors

    Among the GDSL family of serine esterases/lipases is a group of bacterial enzymes that posses C-terminal extensions involved in outer membrane anchoring or translocation. ApeE from Salmonella enterica serovar Typhimurium, a member of this group, has been expressed in Escherichia coli and was resistant to protease digestion when the protease was ...

  • Destabilization dynamics of clay and acid-free polymers of ferric and magnesium salts in AMD without pH adjustment

    The physicochemical treatment was employed to treat acid mine drainage (AMD) in the removal of turbid materials using clay only (exp A) and a combination of clay, FeCl3 and Mg(OH)2 (exp B) to form a polymer. A 5 g sample of clay (bentonite) was added to 1.2 L of AMD and treated in a jar test at 250 rpm for 2 min and reduced to 100 rpm for 10 min. A 200 mL sub-sample from the 1.2 L mother ...


    By IWA Publishing

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